US20210136486A1 - Supporter and electroacoustic transducer device - Google Patents
Supporter and electroacoustic transducer device Download PDFInfo
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- US20210136486A1 US20210136486A1 US17/146,682 US202117146682A US2021136486A1 US 20210136486 A1 US20210136486 A1 US 20210136486A1 US 202117146682 A US202117146682 A US 202117146682A US 2021136486 A1 US2021136486 A1 US 2021136486A1
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- supporter
- slot
- electroacoustic transducer
- face
- circumferential wall
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- 229920001971 elastomer Polymers 0.000 description 6
- 230000005236 sound signal Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- 239000000057 synthetic resin Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2892—Mountings or supports for transducers
- H04R1/2896—Mountings or supports for transducers for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/026—Supports for loudspeaker casings
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2892—Mountings or supports for transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
- H04R1/086—Protective screens, e.g. all weather or wind screens
Definitions
- the following disclosure relates to an electroacoustic transducer device, such as a microphone or a speaker, configured to convert between a sound and an electric signal representing a waveform of the sound, and relates to a supporter used in the electroacoustic transducer device.
- Noise may be generated in an electroacoustic transducer device if a vibration is transmitted to an electroacoustic transducer that converts between a sound and an electric signal representing a waveform of the sound.
- the electric signal will be hereinafter referred to as “sound signal” where appropriate.
- One example of the noise is handling noise generated in a handheld microphone. The handling noise is generated when a vibration is transmitted from a hand holding the microphone to a housing of the microphone and then to the electroacoustic transducer supported in the housing, and a sound signal containing a vibration component is thereby output.
- Patent Document 1 Japanese Examined Utility Model Registration Application Publication No. 7-9506 discloses using, as the supporter, a rubber ring in which a plurality of holes (or grooves) are formed in a circumferential direction of the rubber ring.
- the handling noise is more effectively reduced with an increase in an area of the supporter in which the supporter undergoes shear deformation. This is because a resonance frequency of a vibration generated in a head portion of the microphone is shifted toward a lower frequency side with an increase in the area that undergoes shear deformation, so that the handling noise can be shifted toward a lower frequency side that is lower than a lower limit of a band used for the microphone.
- the area that undergoes shear deformation may be increased by increasing a ring width in plan view while decreasing the thickness of the rubber ring.
- the rubber ring incorporated in the handheld microphone for vibration damping purpose it is, however, difficult for the rubber ring incorporated in the handheld microphone for vibration damping purpose to have an increased ring width due to limitation in size in the radial direction. It is noted that noise may be generated in a stationary microphone as experienced in the handheld microphone, due to the vibration transmitted to the electroacoustic transducer via the housing of the electroacoustic transducer device. Further, such noise may be generated not only in microphones but also in speakers.
- one aspect of the present disclosure is directed to a technique of enhancing an effect of reducing the handling noise without involving an increase in size in the radial direction of the supporter that supports the electroacoustic transducer with respect to the housing of the electroacoustic transducer device.
- a supporter for use in an electroacoustic transducer device including a housing and an electroacoustic transducer mounted to the housing using the supporter includes: a truncated conical shaped body including: a first portion configured to be held in contact with the electroacoustic transducer at a first position; and a second portion configured to be held in contact with the housing at a second position, wherein the second position is disposed spaced from the first position along an axial direction of an axis of the truncated conical shaped body.
- an electroacoustic transducer device in another aspect of the present disclosure, includes: a housing; an electroacoustic transducer; and a supporter mounting the electroacoustic transducer to the housing.
- the supporter including a truncated conical shaped body includes: a first portion held in contact with the electroacoustic transducer at a first position; and a second portion held in contact with the housing at a second position, wherein the second position is disposed spaced from the first position along an axial direction of an axis of the truncated conical shaped body.
- FIG. 1 is a partial cross-sectional view of a microphone 1 A according to a first embodiment
- FIG. 2 is a perspective view of a supporter 30 B according to a second embodiment
- FIG. 3 is a plan view of the supporter 30 B according to the second embodiment
- FIG. 4 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant of the present disclosure.
- FIG. 5 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant.
- FIG. 6 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant.
- FIG. 7 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant.
- FIG. 8 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant.
- FIG. 9 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant.
- FIG. 10 is a view for explaining the shortest distance from a microphone capsule 20 to a housing 10 along a circumferential wall of a supporter of a case 8 ;
- FIG. 11 is a view for explaining the shortest distance from a microphone capsule 20 to a housing 10 along a circumferential wall of a supporter of a case 10 ;
- FIG. 12 is a view illustrating one example of a planar shape of a supporter having two-fold rotation symmetry.
- FIG. 13 is a cross-sectional view of a microphone 1 C according to a third embodiment.
- FIG. 1 is a partial cross-sectional view of a microphone 1 A according to a first embodiment.
- the microphone 1 A is a handheld microphone having a substantially cylindrical shape.
- FIG. 1 is a cross-sectional view of a head portion of the microphone 1 A, taken along a plane including a central axis of the microphone 1 A (i.e., a central axis of the cylindrical shape).
- the microphone 1 A includes: a housing 10 ; a microphone capsule 20 ; a supporter 30 A supporting the microphone capsule 20 with respect to the housing 10 ; and a windshield 40 covering the microphone capsule 20 .
- the housing 10 is a cylindrical member formed of resin or metal.
- a user holds the housing 10 such that the windshield 40 faces vertically upward.
- the windshield 40 is formed of metal mesh, for instance.
- the windshield 40 allows sounds having arrived from the outside to pass through the windshield 40 to an inner space defined by the windshield 40 and the housing 10 .
- the microphone capsule 20 is supported by the supporter 30 A (as one example of “supporter”) in the inner space.
- the microphone capsule 20 is a substantially cylindrical member having a diameter smaller than that of the housing 10 .
- the microphone capsule 20 includes: a diaphragm formed of synthetic resin or metal; and an electroacoustic transducer configured to convert a vibration of the diaphragm caused by sounds having arrived from the outside, to sound signals and output the sound signals.
- FIG. 1 illustration of the diaphragm and the electroacoustic transducer is omitted.
- the electroacoustic transducer may have a configuration similar to that of an electroacoustic transducer of conventional microphones.
- the electroacoustic transducer includes: a voice coil connected to the diaphragm; and magnets and a yoke that generate a magnetic field interlinked with the voice coil.
- the supporter 30 A is a cylindrical member having an inverted truncated conical shape and formed of an elastic material such as fluororubber. That is, the supporter 30 A is formed in a hollow, inverted truncated conical shape having a circumferential wall with a predetermined thickness.
- the supporter 30 A has opposite end faces orthogonal to a central axis of the supporter 30 A (i.e., a rotation axis of the inverted truncated conical shape). In the following description, one of the end faces having a radius smaller than that of the other of the end faces will be referred to as “first end face”, and the other will be referred to as “second end face”.
- the supporter 30 A further has a circumferential wall 315 A connecting the first end face and the second end face.
- the microphone 1 A of the present embodiment is held by the user such that the windshield 40 faces vertically upward.
- the supporter 30 A is attached to the housing 10 such that the first end face is oriented in a vertically downward direction, namely, in a direction indicated by an arrow X in FIG. 1 .
- the first end face of the supporter 30 A has an inside diameter that is substantially equal to an outside diameter of the microphone capsule 20 .
- An inner circumferential portion of the first end face is held in contact with the microphone capsule 20 and functions as a first portion 310 that supports the microphone capsule 20 .
- the second end of the supporter 30 A has an outside diameter that is substantially equal to an inside diameter of the housing 10 .
- An outer circumferential portion of the second end face functions as a second portion 320 that is held in contact with the housing 10 .
- the second portion 320 is held in contact with an inner circumferential surface of the housing 10 , whereby the supporter 30 A is supported with respect to the housing 10 .
- the first portion 310 and the second portion 320 are located at mutually different height levels in the axial direction of the supporter 30 A.
- the first portion 310 is located at a height level lower than that of the second portion 320 .
- the circumferential wall 315 A extends from the first portion 310 to the second portion 320 and is shaped such that an inside diameter of the circumferential wall 315 A increases in a direction from the first portion 310 toward the second portion 320 .
- An area in the supporter 30 A at which the supporter 30 A undergoes shear deformation is the circumferential wall 315 A.
- the supporter 30 A of the present embodiment ensures an enhanced effect of reducing the handling noise without increasing the size of the supporter in the radial direction.
- the first portion 310 is located at a height level lower than that of the second portion 320 in a state in which the central axis of the supporter 30 A extends in parallel with the vertical direction (i.e., the X direction in FIG. 1 ).
- the configuration may be modified such that the supporter 30 A is attached upside down to the housing 10 and the second portion 320 is located at a height level lower than that of the first portion 310 .
- This modified configuration can also enhance the effect of reducing the handling noise without increasing the size of the supporter in the radial direction, as compared with the configuration in which the electroacoustic transducer is supported by the flat, ring-shaped supporter.
- the position of the center of gravity of the microphone capsule 20 (the electroacoustic transducer) with respect to the housing 10 is lower and the stability of the microphone 1 A is higher in the configuration of the embodiment in which the first portion 310 is located at a height level lower than that of the second portion 320 , as compared with the modified configuration in which the second portion 320 is located at a height level lower than that of the first portion 310 .
- the configuration according to the present embodiment is preferable.
- FIG. 2 is a perspective view illustrating an external appearance of a supporter 30 B according to a second embodiment
- FIG. 3 is a plan view of the supporter 30 B viewed on a second-end-face side of the supporter 30 B.
- the supporter 30 B differs from the supporter 30 A of the first embodiment in that the supporter 30 B has holes (slots or cutouts) 330 formed on a circumferential wall 315 B.
- three holes 330 each extending in the circumferential direction of the circumferential wall 315 B are formed on the circumferential wall 315 B such that a planar shape of the supporter 30 B viewed in the central axis direction has three-fold rotation symmetry (i.e., 120-degree rotation symmetry) about the central axis.
- the three holes 330 are formed so as to be shifted relative to each other in the circumferential direction of the circumferential wall 315 B and so as to partly overlap each other in the circumferential direction.
- a range in the circumferential direction of the circumferential wall 315 B over which one of the three holes 330 is formed partly overlaps each of ranges in the circumferential direction over which are respectively formed two of the three holes 330 that are adjacent to the one of the three holes 330 in the circumferential direction.
- the three holes 330 are formed such that a line segment AB drawn in the radial direction in a planar shape of the circumferential wall 315 B when the supporter 30 B is viewed in the central axis direction extends inevitably across at least one of the three holes 330 .
- the three holes 330 are formed such that, in the planar shape of the circumferential wall 315 B when the supporter 30 B is viewed in the central axis direction, the line segment AB, which indicates the shortest path on the circumferential wall 315 B from a point on the first end face (i.e., the first portion 310 ) to a point on the second end face (i.e., the second portion 320 ), extends inevitably across at least one of the three holes 330 at any position in the circumferential direction of the circumferential wall 315 B.
- Each of the three holes 330 includes: a first-diameter hole section 330 B 1 (as one example of “first formed portion”) extending in the circumferential direction of the circumferential wall 315 B; a second-diameter hole section 330 B 2 (as one example of “second formed portion”) extending in the circumferential direction of the circumferential wall 315 B; and a cutout 330 B.
- the first-diameter hole section 330 B 1 is a part of the hole 330 .
- the first-diameter hole section 330 B is formed at a first-diameter region of the circumferential wall 315 B having a first diameter larger than the inside diameter of the first portion 310 (the first end face).
- the three first-diameter hole sections 330 B 1 are disposed so as to be equally spaced apart from each other in the circumferential direction of the circumferential wall 315 B.
- the second-diameter hole section 330 B 2 is a part of the hole 330 .
- the second-diameter hole section 330 B is formed at a second-diameter region of the circumferential wall 315 B having a second diameter larger than the first diameter.
- the three second-diameter hole sections 330 B 2 are disposed so as to be equally spaced apart from each other in the circumferential direction of the circumferential wall 315 B.
- the cutout 330 B 3 is a part of the hole 330 .
- the cutout 330 B 3 is disposed between one end of the first-diameter hole section 330 B 1 and one end of the second-diameter hole section 330 B 2 to connect the one end of the first-diameter hole section 330 B 1 and the one end of the second-diameter hole section 330 B 2 .
- the three first-diameter hole sections 330 B 1 and the three second-diameter hole sections 330 B 2 are shifted relative to each other in the circumferential direction and partly overlap relative to each other in the circumferential direction.
- a range in the circumferential direction of the circumferential wall 315 B over which one of the three first-diameter hole sections 330 B 1 is formed partly overlaps each of ranges in the circumferential direction of the circumferential wall 315 B over which are respectively formed two of the three second-diameter hole sections 330 B 2 that are adjacent to the one of the first-diameter hole sections 330 B in the circumferential direction.
- the three first-diameter hole sections 330 B 1 and the three second-diameter hole sections 330 B 2 are formed such that, in the planar shape of the circumferential wall 315 B when the supporter 30 B is viewed in the central axis direction, the line segment AB drawn in the radial direction extends inevitably across a) one of the first-diameter hole sections 330 B 1 , b) one of the second-diameter hole sections 330 B 2 or c) one of the first-diameter hole sections 330 B 1 and one of the second-diameter hole sections 330 B 2 .
- the three first-diameter hole sections 330 B 1 and the three second-diameter hole sections 330 B 2 are formed such that, in the above-indicated planar shape of the circumferential wall 315 B, the line segment AB that indicates the shortest path from the point on the first end face (i.e., the first portion 310 ) to the point on the second end face (i.e., the second portion 320 ) extends inevitably across a) one of the three the first-diameter hole sections 330 B 1 , b) one of the three second-diameter hole sections 330 B 2 or c) one of the three the first-diameter hole sections 330 B 1 and one of the three second-diameter hole sections 330 B 2 , at any position in the circumferential direction of the circumferential wall 315 B.
- the plurality of slots are arranged so that a line extending in a radial direction of the truncated conical shaped body, in a view taken along a planar elevational view, intersects at least one of the plurality of slots.
- the supporter 30 is constructed as illustrated in FIGS. 2 and 3 for the following reasons.
- the circumferential wall of the supporter By forming the holes on the circumferential wall of the supporter having the inverted truncated conical shape illustrated in the first embodiment, the circumferential wall of the supporter more easily undergoes shear deformation, as compared with the first embodiment.
- the applicant of the present disclosure has conducted experiments for examining a relationship between: the number, the size, and the position, of the holes formed on the circumferential wall of the supporter having the inverted truncated conical shape; and frequency response of the supporter.
- the applicant measured the frequency response for: a supporter (case 1 ) not having holes on the circumferential wall like the supporter 30 A of the first embodiment; and supporters (cases 2 - 4 illustrated in FIG. 4 ) having the holes on the circumferential wall.
- the supporter of case 2 has three holes disposed in rotation symmetry
- the supporter of case 3 has six holes disposed in rotation symmetry
- the supporter of case 4 has twelve holes disposed in rotation symmetry.
- the holes of the supporters of cases 2 - 4 have the same length D in the radial direction.
- Each hole of the supporter of case 3 has a length L′ in the circumferential direction that is half a length L in the circumferential direction of each hole of the supporter of case 2 .
- Each hole of the supporter of case 4 has a length L′′ in the circumferential direction that is half the length L′ in the circumferential direction of each hole of the supporter of the case 3 .
- the holes are thus arranged for allowing an area of a portion of the circumferential wall at which the holes are not formed to be the same among the supporters of cases 2 - 4 .
- the holes are disposed in rotation symmetry in each of the supporters of cases 2 - 4 for preventing the microphone capsule 20 from being inclined when supported by the supporter.
- FIG. 5 indicates measurement results of the frequency response in the supporters of cases 1 - 4 . It is to be understood from the measurement results of FIG.
- the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a low frequency side, namely, shear deformation more easily occurs, owing to provision of the holes on the circumferential wall of the supporter. It is to be further understood that the amount of shift in frequency does not depend on the number of holes if the total area of the holes is the same among the supporters.
- the applicant of the present disclosure measured frequency response for supporters of cases 5 - 7 illustrated in FIG. 6 .
- the holes of the supporters of cases 5 - 7 have the same length L in the circumferential direction.
- the length D of the hole in the radial direction is made different among the supports of cases 5 - 7 , i.e., cases 5 - 7 : D ⁇ D′ ⁇ D′′ as illustrated in FIG. 6 .
- FIG. 7 indicates measurement results. It is to be understood from the measurement results of FIG. 7 that the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a lower frequency side with an increase in the length of the hole in the radial direction.
- the applicant of the present disclosure measured frequency response for supporters (cases 8 - 10 ).
- three pairs of holes are disposed in rotation symmetry, two holes in each pair being arranged in the radial direction and extending in the circumferential direction.
- the two holes arranged in the radial direction are shifted relative to each other in the circumferential direction by 30 degrees.
- the two holes arranged in the radial direction are shifted relative to each other in the circumferential direction by 60 degrees.
- FIG. 9 indicates measurement results. It is to be understood from the measurement results of FIG.
- the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a lower frequency side with an increase in an amount by which the holes arranged in the radial direction are shifted relative to each other in the circumferential direction, i.e., a shift amount.
- the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a lower frequency side for the following reasons.
- the shortest path AB (i.e., the shortest path that does not pass across any holes 330 ) along the circumferential wall from the microphone capsule 20 to the housing 10 is equal to a line segment drawn in the radial direction along the circumferential wall, as illustrated in FIG. 10 .
- a line segment drawn in the radial direction extends inevitably across at least one of the plurality of holes. That is, in the supporter of case 10 illustrated in FIG.
- the shortest path AB (i.e., the shortest path that does not pass across any holes 330 ) along the circumferential wall from the microphone capsule 20 to the housing 10 is larger, as compared with that of the supporter of case 8 .
- the supporter of case 10 includes, along the shortest path AB (i.e., the shortest path that does not pass across any holes 330 ), a narrow width portion in which the width is locally small, as indicated by a portion enclosed by dashed line in FIG. 11 .
- a supporter 30 B 2 of the present embodiment corresponding to the supporter of case 10 includes three first holes 330 B 12 (each as one example of “first formed portion”) extending in the circumferential direction of the circumferential wall 315 B and three second holes 330 B 22 (each as one example of “second formed portion”) extending in the circumferential direction of the circumferential wall 315 B.
- first holes 330 B 12 each as one example of “first formed portion”
- second holes 330 B 22 each as one example of “second formed portion”
- each of the three first holes 330 B 12 is formed at the first-diameter region of the circumferential wall 315 B having the first diameter larger than the inside diameter of the first portion 310 (i.e., the first end face).
- the three first holes 330 B 12 are disposed so as to be equally spaced apart from each other in the circumferential direction of the circumferential wall 315 B.
- the three second holes 330 B 22 are formed at the second-diameter region of the circumferential wall 315 B having the second diameter larger than the first diameter.
- the three second holes 330 B 22 are disposed so as to be spaced apart from each other in the circumferential direction of the circumferential wall 315 B.
- One of the three first holes 330 B 12 and a corresponding one of the three second holes 330 B 22 are shifted relative to each other in the circumferential direction of the circumferential wall 315 B.
- the three first holes 330 B 12 and the three second holes 330 B 22 are shifted relative to each other in the circumferential direction and partly overlap relative to each other in the circumferential direction. That is, a range in the circumferential direction of the circumferential wall 315 B over which one of the three first holes 330 B 12 is formed partly overlaps each of ranges in the circumferential direction of the circumferential wall 315 B over which are respectively formed two of the three second holes 330 B 22 that are adjacent to the one of the three first holes 330 B 12 in the circumferential direction.
- the three first holes 330 B 12 and the three second holes 330 B 22 are formed such that, in the planar shape of the circumferential wall 315 B when the supporter 30 B 2 is viewed in the central axis, a line segment AB drawn in the radial direction (similar to that in FIG. 3 ) extends inevitably across a) one of the three first holes 330 B 12 , b) one of the three second holes 330 B 22 or c) one of the three first holes 330 B 12 and one of the three second holes 330 B 22 .
- the three first holes 330 B 12 and the three second holes 330 B 22 are formed such that, in the above-indicated planar shape of the circumferential wall 315 B, a line segment (similar to that in FIG. 3 ) that indicates the shortest path from a point on the first end face (i.e., the first portion 310 ) to a point on the second end face (i.e., the second portion 320 ) extends inevitably across a) one of the three first holes 330 B 12 , b) one of the three second holes 330 B 22 or c) one of the three first holes 330 B 12 and one of the three second holes 330 B 22 , at any position in the circumferential direction of the circumferential wall 315 B.
- the amount by which the first hole 330 B 12 and the second hole 330 B 22 arranged in the radial direction are shifted relative to each other is not limited to 60 degrees.
- the shift amount may be determined to allow the shortest path along the circumferential wall from the microphone capsule 20 to the housing 10 to be as long as possible. In other words, the shift amount may be determined to allow the line segment drawn in the radial direction in the planar shape of the supporter to extend inevitably across at least one of the plurality of holes formed on the circumferential wall of the supporter.
- the supporter 30 B includes three pairs of the holes 330 B 1 , 330 B 2 disposed in rotation symmetry, the two holes 330 B 1 , 330 B 2 in each pair being arranged in the radial direction and extending in the circumferential direction.
- the supporter 30 B according to the present embodiment includes the cutouts 330 B 3 (one of which is indicated by a portion enclosed by dashed line in FIG. 3 ). Each cutout 330 B 3 connects corresponding holes 330 B 1 , 330 B 2 arranged in the radial direction so as to allow the two holes 330 B 1 , 330 B 2 to function as one hole.
- the cutout 330 B 3 is one example of “connecting portion”.
- the cutouts 330 B 3 allow shear deformation in the circumferential direction to occur as easily as possible. It is considered that shear deformation in the circumferential direction occurs more easily in a supporter 30 B 3 illustrated in FIG. 12 in which two holes 3303 , each including a first-diameter hole section 330 B 13 and a second-diameter hole section 330 B 23 , are disposed such that a planar shape of the supporter 30 B 3 viewed in the axial direction has two-fold rotation symmetry about the axis.
- the stability with which the microphone capsule 20 is supported is lower in the supporter 30 B 3 of FIG. 12 than in the supporter 30 B of FIGS. 2 and 3 .
- the supporter 30 B of FIGS. 2 and 3 can support the microphone capsule 20 at three points in accordance with the symmetry of the supporter 30 B as a whole (three-fold rotation symmetry) whereas the supporter 30 B 3 of FIG. 12 supports the microphone capsule 20 at two points. It is thus preferable to employ three-fold rotation symmetry illustrated in FIG. 2 and FIG. 3 .
- the supporter in the present embodiment enhances the effect of reducing the noise without increasing the size of the supporter in the radial direction. Moreover, the supporter in the present embodiment ensures a higher effect of reducing the noise than the supporter of the first embodiment.
- the microphone 1 has only one supporter 30 A having the inverted truncated conical shape.
- the microphone capsule 20 may be supported by a plurality of the supporters 30 A.
- FIG. 13 is a cross-sectional view of a head portion of a microphone 1 C in which the microphone capsule 20 is supported by the two supporters 30 A.
- rotation symmetry need not be the same among the plurality of supporters.
- the planar shapes of the supporters need not overlap when viewed in the central axis direction.
- two supporters each having two-fold rotation symmetry i.e., line symmetry
- This configuration ensures the stability in supporting the microphone capsule 20 while enabling the two supporters to more easily undergo shear deformation, as compared with the configuration in which is used only one supporter having three-fold rotation symmetry.
- the embodiments illustrated above may be modified as follows.
- the plurality of holes 330 are disposed such that the planar shape of the supporter 30 B viewed in the axial direction has three-fold rotation symmetry about the axis.
- the plurality of holes 330 may be disposed such that the planar shape has four- or more-fold rotation symmetry.
- the plurality holes 330 are disposed in N- or more-fold rotation symmetry.
- N is a natural number greater than or equal to 3.
- the supporter 30 B of the second embodiment has the planar shape illustrated in FIG. 3 .
- the supporter 30 B may have the planar shape of any of the supporters of cases 2 - 10 illustrated above. This is because, as long as the holes that extend in the circumferential direction are formed on the circumferential wall, it is considered that shear deformation in the circumferential direction occurs more easily, as compared with the supporter 30 A of the first embodiment.
- the supporter 30 B of the second embodiment has the hollow, inverted truncated conical shape.
- the supporter 30 B of the second embodiment may be shaped like a disc, for instance.
- the disc-like supporter may have the holes 330 or the third portions 330 similar to those in the second embodiment.
- the supporter in each embodiment is formed of an elastic material such as fluororubber.
- the supporter has elasticity owing to material.
- the supporter may be formed of resin. This is because the area of the supporter that undergoes shear deformation can be ensured owing to shape if the supporter has the holes as in the second embodiment or the supporter has the third portions in place of the holes as in the modification (1).
- the principle of the present disclosure is applied to the handheld microphone in the illustrated embodiments, it may be applicable to stationary microphones because the sound signal that includes the noise arising from the vibration transmitted via the housing is output from the electroacoustic transducer in the stationary microphones.
- the principle of the present disclosure may be applied to speakers, thereby making it possible to reduce noise emitted due to transmission of the vibration to the electroacoustic transducer via the housing of the speakers.
- the vibration is prevented from being transmitted to the electroacoustic transducer via the housing and the noise due to the vibration is thereby prevented from being generated in the electroacoustic transducer device including the housing and the electroacoustic transducer, by providing the supporter formed in the inverted truncated conical shape and including the first portion held in contact with the electroacoustic transducer and the second portion held in contact with the housing, the first portion and the second portion being positioned at mutually different height levels in the axial direction.
Abstract
Description
- The present application is a continuation application of International Application No. PCT/JP2019/027407, filed on Jul. 10, 2019, which claims priority to Japanese Patent Application No. 2018-134023, filed on Jul. 17, 2018. The contents of these applications are incorporated by reference in their entirety.
- The following disclosure relates to an electroacoustic transducer device, such as a microphone or a speaker, configured to convert between a sound and an electric signal representing a waveform of the sound, and relates to a supporter used in the electroacoustic transducer device.
- Noise may be generated in an electroacoustic transducer device if a vibration is transmitted to an electroacoustic transducer that converts between a sound and an electric signal representing a waveform of the sound. The electric signal will be hereinafter referred to as “sound signal” where appropriate. One example of the noise is handling noise generated in a handheld microphone. The handling noise is generated when a vibration is transmitted from a hand holding the microphone to a housing of the microphone and then to the electroacoustic transducer supported in the housing, and a sound signal containing a vibration component is thereby output.
- To reduce the handling noise, a structure for supporting the electroacoustic transducer with respect to the housing has been proposed. In this structure, an insulator (hereinafter referred to as “supporter” where appropriate) formed of an elastic material such as rubber is interposed between the electroacoustic transducer and the housing. For instance, Patent Document 1 (Japanese Examined Utility Model Registration Application Publication No. 7-9506) discloses using, as the supporter, a rubber ring in which a plurality of holes (or grooves) are formed in a circumferential direction of the rubber ring.
- In a case where the handling noise is reduced using the supporter, the handling noise is more effectively reduced with an increase in an area of the supporter in which the supporter undergoes shear deformation. This is because a resonance frequency of a vibration generated in a head portion of the microphone is shifted toward a lower frequency side with an increase in the area that undergoes shear deformation, so that the handling noise can be shifted toward a lower frequency side that is lower than a lower limit of a band used for the microphone. In the rubber ring indicated above, the area that undergoes shear deformation may be increased by increasing a ring width in plan view while decreasing the thickness of the rubber ring. It is, however, difficult for the rubber ring incorporated in the handheld microphone for vibration damping purpose to have an increased ring width due to limitation in size in the radial direction. It is noted that noise may be generated in a stationary microphone as experienced in the handheld microphone, due to the vibration transmitted to the electroacoustic transducer via the housing of the electroacoustic transducer device. Further, such noise may be generated not only in microphones but also in speakers.
- Accordingly, one aspect of the present disclosure is directed to a technique of enhancing an effect of reducing the handling noise without involving an increase in size in the radial direction of the supporter that supports the electroacoustic transducer with respect to the housing of the electroacoustic transducer device.
- In one aspect of the present disclosure, a supporter for use in an electroacoustic transducer device including a housing and an electroacoustic transducer mounted to the housing using the supporter includes: a truncated conical shaped body including: a first portion configured to be held in contact with the electroacoustic transducer at a first position; and a second portion configured to be held in contact with the housing at a second position, wherein the second position is disposed spaced from the first position along an axial direction of an axis of the truncated conical shaped body.
- In another aspect of the present disclosure, an electroacoustic transducer device includes: a housing; an electroacoustic transducer; and a supporter mounting the electroacoustic transducer to the housing. The supporter including a truncated conical shaped body includes: a first portion held in contact with the electroacoustic transducer at a first position; and a second portion held in contact with the housing at a second position, wherein the second position is disposed spaced from the first position along an axial direction of an axis of the truncated conical shaped body.
- The objects, features, advantages, and technical and industrial significance of the present disclosure will be better understood by reading the following detailed description of embodiments, when considered in connection with the accompanying drawings, in which:
-
FIG. 1 is a partial cross-sectional view of amicrophone 1A according to a first embodiment; -
FIG. 2 is a perspective view of asupporter 30B according to a second embodiment; -
FIG. 3 is a plan view of thesupporter 30B according to the second embodiment; -
FIG. 4 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant of the present disclosure; -
FIG. 5 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant; -
FIG. 6 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant; -
FIG. 7 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant; -
FIG. 8 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant; -
FIG. 9 is a view for explaining frequency response measurement experiments conducted on supporters by the applicant; -
FIG. 10 is a view for explaining the shortest distance from amicrophone capsule 20 to ahousing 10 along a circumferential wall of a supporter of acase 8; -
FIG. 11 is a view for explaining the shortest distance from amicrophone capsule 20 to ahousing 10 along a circumferential wall of a supporter of acase 10; -
FIG. 12 is a view illustrating one example of a planar shape of a supporter having two-fold rotation symmetry; and - and
FIG. 13 is a cross-sectional view of a microphone 1C according to a third embodiment. - There will be hereinafter described embodiments of the present disclosure.
-
FIG. 1 is a partial cross-sectional view of amicrophone 1A according to a first embodiment. Themicrophone 1A is a handheld microphone having a substantially cylindrical shape.FIG. 1 is a cross-sectional view of a head portion of themicrophone 1A, taken along a plane including a central axis of themicrophone 1A (i.e., a central axis of the cylindrical shape). As illustrated inFIG. 1 , themicrophone 1A includes: ahousing 10; amicrophone capsule 20; asupporter 30A supporting themicrophone capsule 20 with respect to thehousing 10; and awindshield 40 covering themicrophone capsule 20. - The
housing 10 is a cylindrical member formed of resin or metal. When using themicrophone 1A, a user holds thehousing 10 such that thewindshield 40 faces vertically upward. Thewindshield 40 is formed of metal mesh, for instance. Thewindshield 40 allows sounds having arrived from the outside to pass through thewindshield 40 to an inner space defined by thewindshield 40 and thehousing 10. As illustrated inFIG. 1 , themicrophone capsule 20 is supported by thesupporter 30A (as one example of “supporter”) in the inner space. - The
microphone capsule 20 is a substantially cylindrical member having a diameter smaller than that of thehousing 10. Themicrophone capsule 20 includes: a diaphragm formed of synthetic resin or metal; and an electroacoustic transducer configured to convert a vibration of the diaphragm caused by sounds having arrived from the outside, to sound signals and output the sound signals. InFIG. 1 , illustration of the diaphragm and the electroacoustic transducer is omitted. The electroacoustic transducer may have a configuration similar to that of an electroacoustic transducer of conventional microphones. Specifically, the electroacoustic transducer includes: a voice coil connected to the diaphragm; and magnets and a yoke that generate a magnetic field interlinked with the voice coil. - The
supporter 30A is a cylindrical member having an inverted truncated conical shape and formed of an elastic material such as fluororubber. That is, thesupporter 30A is formed in a hollow, inverted truncated conical shape having a circumferential wall with a predetermined thickness. Thesupporter 30A has opposite end faces orthogonal to a central axis of thesupporter 30A (i.e., a rotation axis of the inverted truncated conical shape). In the following description, one of the end faces having a radius smaller than that of the other of the end faces will be referred to as “first end face”, and the other will be referred to as “second end face”. Thesupporter 30A further has acircumferential wall 315A connecting the first end face and the second end face. - As described above, the
microphone 1A of the present embodiment is held by the user such that thewindshield 40 faces vertically upward. In this state, thesupporter 30A is attached to thehousing 10 such that the first end face is oriented in a vertically downward direction, namely, in a direction indicated by an arrow X inFIG. 1 . The first end face of thesupporter 30A has an inside diameter that is substantially equal to an outside diameter of themicrophone capsule 20. An inner circumferential portion of the first end face is held in contact with themicrophone capsule 20 and functions as afirst portion 310 that supports themicrophone capsule 20. The second end of thesupporter 30A has an outside diameter that is substantially equal to an inside diameter of thehousing 10. An outer circumferential portion of the second end face functions as asecond portion 320 that is held in contact with thehousing 10. Thesecond portion 320 is held in contact with an inner circumferential surface of thehousing 10, whereby thesupporter 30A is supported with respect to thehousing 10. In themicrophone 1A of the present embodiment, thefirst portion 310 and thesecond portion 320 are located at mutually different height levels in the axial direction of thesupporter 30A. In a state in which themicrophone 1A is held by the user such that thewindshield 40 and themicrophone capsule 20 face vertically upward and the central axis of thesupporter 30A extends in parallel with the vertical direction, thefirst portion 310 is located at a height level lower than that of thesecond portion 320. Thecircumferential wall 315A extends from thefirst portion 310 to thesecond portion 320 and is shaped such that an inside diameter of thecircumferential wall 315A increases in a direction from thefirst portion 310 toward thesecond portion 320. - An area in the
supporter 30A at which thesupporter 30A undergoes shear deformation is thecircumferential wall 315A. By increasing the size of thesupporter 30A in the central axis direction, namely, by increasing the height of the truncated conical shape, the area that undergoes shear deformation can be increased without involving an increase in size in the radial direction. Thus, as compared with a configuration in which the electroacoustic transducer is supported by a flat, ring-shaped supporter, thesupporter 30A of the present embodiment ensures an enhanced effect of reducing the handling noise without increasing the size of the supporter in the radial direction. - In the first embodiment, the
first portion 310 is located at a height level lower than that of thesecond portion 320 in a state in which the central axis of thesupporter 30A extends in parallel with the vertical direction (i.e., the X direction inFIG. 1 ). The configuration may be modified such that thesupporter 30A is attached upside down to thehousing 10 and thesecond portion 320 is located at a height level lower than that of thefirst portion 310. This modified configuration can also enhance the effect of reducing the handling noise without increasing the size of the supporter in the radial direction, as compared with the configuration in which the electroacoustic transducer is supported by the flat, ring-shaped supporter. It is noted, however, that the position of the center of gravity of the microphone capsule 20 (the electroacoustic transducer) with respect to thehousing 10 is lower and the stability of themicrophone 1A is higher in the configuration of the embodiment in which thefirst portion 310 is located at a height level lower than that of thesecond portion 320, as compared with the modified configuration in which thesecond portion 320 is located at a height level lower than that of thefirst portion 310. Thus, the configuration according to the present embodiment is preferable. -
FIG. 2 is a perspective view illustrating an external appearance of asupporter 30B according to a second embodiment, andFIG. 3 is a plan view of thesupporter 30B viewed on a second-end-face side of thesupporter 30B. As illustrated inFIGS. 2 and 3 , thesupporter 30B differs from thesupporter 30A of the first embodiment in that thesupporter 30B has holes (slots or cutouts) 330 formed on acircumferential wall 315B. Specifically, threeholes 330 each extending in the circumferential direction of thecircumferential wall 315B are formed on thecircumferential wall 315B such that a planar shape of thesupporter 30B viewed in the central axis direction has three-fold rotation symmetry (i.e., 120-degree rotation symmetry) about the central axis. The threeholes 330 are formed so as to be shifted relative to each other in the circumferential direction of thecircumferential wall 315B and so as to partly overlap each other in the circumferential direction. That is, a range in the circumferential direction of thecircumferential wall 315B over which one of the threeholes 330 is formed partly overlaps each of ranges in the circumferential direction over which are respectively formed two of the threeholes 330 that are adjacent to the one of the threeholes 330 in the circumferential direction. Thus, the threeholes 330 are formed such that a line segment AB drawn in the radial direction in a planar shape of thecircumferential wall 315B when thesupporter 30B is viewed in the central axis direction extends inevitably across at least one of the threeholes 330. In other words, the threeholes 330 are formed such that, in the planar shape of thecircumferential wall 315B when thesupporter 30B is viewed in the central axis direction, the line segment AB, which indicates the shortest path on thecircumferential wall 315B from a point on the first end face (i.e., the first portion 310) to a point on the second end face (i.e., the second portion 320), extends inevitably across at least one of the threeholes 330 at any position in the circumferential direction of thecircumferential wall 315B. - Each of the three
holes 330 includes: a first-diameter hole section 330B1 (as one example of “first formed portion”) extending in the circumferential direction of thecircumferential wall 315B; a second-diameter hole section 330B2 (as one example of “second formed portion”) extending in the circumferential direction of thecircumferential wall 315B; and a cutout 330B. The first-diameter hole section 330B1 is a part of thehole 330. The first-diameter hole section 330B is formed at a first-diameter region of thecircumferential wall 315B having a first diameter larger than the inside diameter of the first portion 310 (the first end face). The three first-diameter hole sections 330B1 are disposed so as to be equally spaced apart from each other in the circumferential direction of thecircumferential wall 315B. The second-diameter hole section 330B2 is a part of thehole 330. The second-diameter hole section 330B is formed at a second-diameter region of thecircumferential wall 315B having a second diameter larger than the first diameter. The three second-diameter hole sections 330B2 are disposed so as to be equally spaced apart from each other in the circumferential direction of thecircumferential wall 315B. The cutout 330B3 is a part of thehole 330. The cutout 330B3 is disposed between one end of the first-diameter hole section 330B1 and one end of the second-diameter hole section 330B2 to connect the one end of the first-diameter hole section 330B1 and the one end of the second-diameter hole section 330B2. As illustrated inFIG. 3 , the three first-diameter hole sections 330B1 and the three second-diameter hole sections 330B2 are shifted relative to each other in the circumferential direction and partly overlap relative to each other in the circumferential direction. That is, a range in the circumferential direction of thecircumferential wall 315B over which one of the three first-diameter hole sections 330B1 is formed partly overlaps each of ranges in the circumferential direction of thecircumferential wall 315B over which are respectively formed two of the three second-diameter hole sections 330B2 that are adjacent to the one of the first-diameter hole sections 330B in the circumferential direction. In this configuration, the three first-diameter hole sections 330B1 and the three second-diameter hole sections 330B2 are formed such that, in the planar shape of thecircumferential wall 315B when thesupporter 30B is viewed in the central axis direction, the line segment AB drawn in the radial direction extends inevitably across a) one of the first-diameter hole sections 330B1, b) one of the second-diameter hole sections 330B2 or c) one of the first-diameter hole sections 330B1 and one of the second-diameter hole sections 330B2. In other words, the three first-diameter hole sections 330B1 and the three second-diameter hole sections 330B2 are formed such that, in the above-indicated planar shape of thecircumferential wall 315B, the line segment AB that indicates the shortest path from the point on the first end face (i.e., the first portion 310) to the point on the second end face (i.e., the second portion 320) extends inevitably across a) one of the three the first-diameter hole sections 330B1, b) one of the three second-diameter hole sections 330B2 or c) one of the three the first-diameter hole sections 330B1 and one of the three second-diameter hole sections 330B2, at any position in the circumferential direction of thecircumferential wall 315B. In other words, the plurality of slots are arranged so that a line extending in a radial direction of the truncated conical shaped body, in a view taken along a planar elevational view, intersects at least one of the plurality of slots. In the present embodiment, the supporter 30 is constructed as illustrated inFIGS. 2 and 3 for the following reasons. - By forming the holes on the circumferential wall of the supporter having the inverted truncated conical shape illustrated in the first embodiment, the circumferential wall of the supporter more easily undergoes shear deformation, as compared with the first embodiment. The applicant of the present disclosure has conducted experiments for examining a relationship between: the number, the size, and the position, of the holes formed on the circumferential wall of the supporter having the inverted truncated conical shape; and frequency response of the supporter.
- Specifically, the applicant measured the frequency response for: a supporter (case 1) not having holes on the circumferential wall like the
supporter 30A of the first embodiment; and supporters (cases 2-4 illustrated inFIG. 4 ) having the holes on the circumferential wall. As illustrated inFIG. 4 , the supporter ofcase 2 has three holes disposed in rotation symmetry, the supporter ofcase 3 has six holes disposed in rotation symmetry, and the supporter ofcase 4 has twelve holes disposed in rotation symmetry. The holes of the supporters of cases 2-4 have the same length D in the radial direction. Each hole of the supporter ofcase 3 has a length L′ in the circumferential direction that is half a length L in the circumferential direction of each hole of the supporter ofcase 2. Each hole of the supporter ofcase 4 has a length L″ in the circumferential direction that is half the length L′ in the circumferential direction of each hole of the supporter of thecase 3. In the supporters of cases 2-4, the holes are thus arranged for allowing an area of a portion of the circumferential wall at which the holes are not formed to be the same among the supporters of cases 2-4. Further, the holes are disposed in rotation symmetry in each of the supporters of cases 2-4 for preventing themicrophone capsule 20 from being inclined when supported by the supporter.FIG. 5 indicates measurement results of the frequency response in the supporters of cases 1-4. It is to be understood from the measurement results ofFIG. 5 that the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a low frequency side, namely, shear deformation more easily occurs, owing to provision of the holes on the circumferential wall of the supporter. It is to be further understood that the amount of shift in frequency does not depend on the number of holes if the total area of the holes is the same among the supporters. - The applicant of the present disclosure measured frequency response for supporters of cases 5-7 illustrated in
FIG. 6 . In each of the supporters of cases 5-7, three holes are disposed in rotation symmetry. The holes of the supporters of cases 5-7 have the same length L in the circumferential direction. However, the length D of the hole in the radial direction is made different among the supports of cases 5-7, i.e., cases 5-7: D<D′<D″ as illustrated inFIG. 6 .FIG. 7 indicates measurement results. It is to be understood from the measurement results ofFIG. 7 that the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a lower frequency side with an increase in the length of the hole in the radial direction. - As illustrated in
FIG. 8 , the applicant of the present disclosure measured frequency response for supporters (cases 8-10). In the supporter ofcase 8, three pairs of holes are disposed in rotation symmetry, two holes in each pair being arranged in the radial direction and extending in the circumferential direction. In the supporter ofcase 9, the two holes arranged in the radial direction are shifted relative to each other in the circumferential direction by 30 degrees. In the supporter ofcase 10, the two holes arranged in the radial direction are shifted relative to each other in the circumferential direction by 60 degrees.FIG. 9 indicates measurement results. It is to be understood from the measurement results ofFIG. 9 that the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a lower frequency side with an increase in an amount by which the holes arranged in the radial direction are shifted relative to each other in the circumferential direction, i.e., a shift amount. Here, by shifting the positional relationship of the holes arranged in the radial direction, the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a lower frequency side for the following reasons. - As for the supporter of
case 8 illustrated inFIG. 8 , the shortest path AB (i.e., the shortest path that does not pass across any holes 330) along the circumferential wall from themicrophone capsule 20 to thehousing 10 is equal to a line segment drawn in the radial direction along the circumferential wall, as illustrated inFIG. 10 . As for the supporter ofcase 10 illustrated inFIG. 8 , a line segment drawn in the radial direction extends inevitably across at least one of the plurality of holes. That is, in the supporter ofcase 10 illustrated inFIG. 8 , the shortest path AB (i.e., the shortest path that does not pass across any holes 330) along the circumferential wall from themicrophone capsule 20 to thehousing 10 is larger, as compared with that of the supporter ofcase 8. Thus, the supporter ofcase 10 includes, along the shortest path AB (i.e., the shortest path that does not pass across any holes 330), a narrow width portion in which the width is locally small, as indicated by a portion enclosed by dashed line inFIG. 11 . Owing to the narrow width portion, shear deformation is allowed to occur easily in the circumferential direction in the supporter ofcase 10, as compared with the supporter ofcase 8, so that the resonance frequency of the vibration generated in the head portion of the microphone is shifted toward a low frequency side. As illustrated inFIG. 11 , a supporter 30B2 of the present embodiment corresponding to the supporter ofcase 10 includes three first holes 330B12 (each as one example of “first formed portion”) extending in the circumferential direction of thecircumferential wall 315B and three second holes 330B22 (each as one example of “second formed portion”) extending in the circumferential direction of thecircumferential wall 315B. Like the first-diameter hole section 330B1 ofFIG. 3 , each of the three first holes 330B12 is formed at the first-diameter region of thecircumferential wall 315B having the first diameter larger than the inside diameter of the first portion 310 (i.e., the first end face). The three first holes 330B12 are disposed so as to be equally spaced apart from each other in the circumferential direction of thecircumferential wall 315B. Like the second-diameter hole section 330B2 ofFIG. 3 , the three second holes 330B22 are formed at the second-diameter region of thecircumferential wall 315B having the second diameter larger than the first diameter. The three second holes 330B22 are disposed so as to be spaced apart from each other in the circumferential direction of thecircumferential wall 315B. One of the three first holes 330B12 and a corresponding one of the three second holes 330B22 are shifted relative to each other in the circumferential direction of thecircumferential wall 315B. The three first holes 330B12 and the three second holes 330B22 are shifted relative to each other in the circumferential direction and partly overlap relative to each other in the circumferential direction. That is, a range in the circumferential direction of thecircumferential wall 315B over which one of the three first holes 330B12 is formed partly overlaps each of ranges in the circumferential direction of thecircumferential wall 315B over which are respectively formed two of the three second holes 330B22 that are adjacent to the one of the three first holes 330B12 in the circumferential direction. In this configuration, the three first holes 330B12 and the three second holes 330B22 are formed such that, in the planar shape of thecircumferential wall 315B when the supporter 30B2 is viewed in the central axis, a line segment AB drawn in the radial direction (similar to that inFIG. 3 ) extends inevitably across a) one of the three first holes 330B12, b) one of the three second holes 330B22 or c) one of the three first holes 330B12 and one of the three second holes 330B22. In other words, the three first holes 330B12 and the three second holes 330B22 are formed such that, in the above-indicated planar shape of thecircumferential wall 315B, a line segment (similar to that inFIG. 3 ) that indicates the shortest path from a point on the first end face (i.e., the first portion 310) to a point on the second end face (i.e., the second portion 320) extends inevitably across a) one of the three first holes 330B12, b) one of the three second holes 330B22 or c) one of the three first holes 330B12 and one of the three second holes 330B22, at any position in the circumferential direction of thecircumferential wall 315B. - The amount by which the first hole 330B12 and the second hole 330B22 arranged in the radial direction are shifted relative to each other is not limited to 60 degrees. The shift amount may be determined to allow the shortest path along the circumferential wall from the
microphone capsule 20 to thehousing 10 to be as long as possible. In other words, the shift amount may be determined to allow the line segment drawn in the radial direction in the planar shape of the supporter to extend inevitably across at least one of the plurality of holes formed on the circumferential wall of the supporter. - In view of the above observation, as illustrated in
FIG. 3 , thesupporter 30B according to the present embodiment includes three pairs of the holes 330B1, 330B2 disposed in rotation symmetry, the two holes 330B1, 330B2 in each pair being arranged in the radial direction and extending in the circumferential direction. In addition, thesupporter 30B according to the present embodiment includes the cutouts 330B3 (one of which is indicated by a portion enclosed by dashed line inFIG. 3 ). Each cutout 330B3 connects corresponding holes 330B1, 330B2 arranged in the radial direction so as to allow the two holes 330B1, 330B2 to function as one hole. The cutout 330B3 is one example of “connecting portion”. The cutouts 330B3 allow shear deformation in the circumferential direction to occur as easily as possible. It is considered that shear deformation in the circumferential direction occurs more easily in a supporter 30B3 illustrated inFIG. 12 in which twoholes 3303, each including a first-diameter hole section 330B13 and a second-diameter hole section 330B23, are disposed such that a planar shape of the supporter 30B3 viewed in the axial direction has two-fold rotation symmetry about the axis. However, the stability with which themicrophone capsule 20 is supported is lower in the supporter 30B3 ofFIG. 12 than in thesupporter 30B ofFIGS. 2 and 3 . This is because thesupporter 30B ofFIGS. 2 and 3 can support themicrophone capsule 20 at three points in accordance with the symmetry of thesupporter 30B as a whole (three-fold rotation symmetry) whereas the supporter 30B3 ofFIG. 12 supports themicrophone capsule 20 at two points. It is thus preferable to employ three-fold rotation symmetry illustrated inFIG. 2 andFIG. 3 . - As explained above, as compared with the conventional configuration in which the electroacoustic transducer is supported with respect to the housing of the electroacoustic transducer device by the flat, ring-shaped supporter, the supporter in the present embodiment enhances the effect of reducing the noise without increasing the size of the supporter in the radial direction. Moreover, the supporter in the present embodiment ensures a higher effect of reducing the noise than the supporter of the first embodiment.
- In the first embodiment, the
microphone 1 has only onesupporter 30A having the inverted truncated conical shape. Themicrophone capsule 20 may be supported by a plurality of thesupporters 30A.FIG. 13 is a cross-sectional view of a head portion of a microphone 1C in which themicrophone capsule 20 is supported by the twosupporters 30A. By supporting themicrophone capsule 20 by the plurality of thesupporters 30A, the stability with which themicrophone capsule 20 is supported is higher in the third embodiment than in the first embodiment or the second embodiment in which themicrophone capsule 20 is supported by the single supporter having the inverted truncated conical shape. - In a case where the
microphone capsule 20 is supported by a plurality of supporters having rotation symmetry similar to that of thesupporter 30B of the second embodiment, rotation symmetry need not be the same among the plurality of supporters. Further, even in a case where the plurality of supporters have the same rotation symmetry, the planar shapes of the supporters need not overlap when viewed in the central axis direction. For instance, two supporters each having two-fold rotation symmetry (i.e., line symmetry) may be disposed such that symmetry axes (axes of line symmetry) of the respective two supporters are orthogonal to each other to support themicrophone capsule 20. This configuration ensures the stability in supporting themicrophone capsule 20 while enabling the two supporters to more easily undergo shear deformation, as compared with the configuration in which is used only one supporter having three-fold rotation symmetry. - There have been explained above the first through third embodiments of the present disclosure. The embodiments illustrated above may be modified as follows. (1) In the second embodiment, the plurality of
holes 330 are disposed such that the planar shape of thesupporter 30B viewed in the axial direction has three-fold rotation symmetry about the axis. The plurality ofholes 330 may be disposed such that the planar shape has four- or more-fold rotation symmetry. In short, the plurality holes 330 are disposed in N- or more-fold rotation symmetry. Here, N is a natural number greater than or equal to 3. This configuration enables the supporter to more easily undergo local shear deformation while enabling the electroacoustic transducer to be supported without being inclined, by keeping the symmetry of the supporter as a whole at N-fold rotation symmetry about the axis of the inverted truncated conical shape. Thesupporter 30B of the second embodiment has the planar shape illustrated inFIG. 3 . Thesupporter 30B may have the planar shape of any of the supporters of cases 2-10 illustrated above. This is because, as long as the holes that extend in the circumferential direction are formed on the circumferential wall, it is considered that shear deformation in the circumferential direction occurs more easily, as compared with thesupporter 30A of the first embodiment. - (2) In place of the
holes 330 of the second embodiment, there may be formed third portions each having a thickness smaller than that of other portion of thesupporter 30B. This configuration also enables the circumferential wall of the supporter having the inverted truncated conical shape to easily undergo shear deformation, as compared with a configuration in which the supporter has neither the holes 330 (as described in the first embodiment) nor the third portions each as the portion having a thickness smaller than that of other portion of the supporter. Thus, the effect of reducing the noise can be enhanced. Thesupporter 30B of the second embodiment has the hollow, inverted truncated conical shape. Instead, thesupporter 30B of the second embodiment may be shaped like a disc, for instance. The disc-like supporter may have theholes 330 or thethird portions 330 similar to those in the second embodiment. - (3) The supporter in each embodiment is formed of an elastic material such as fluororubber. Thus, the supporter has elasticity owing to material. The supporter may be formed of resin. This is because the area of the supporter that undergoes shear deformation can be ensured owing to shape if the supporter has the holes as in the second embodiment or the supporter has the third portions in place of the holes as in the modification (1).
- (4) Though the principle of the present disclosure is applied to the handheld microphone in the illustrated embodiments, it may be applicable to stationary microphones because the sound signal that includes the noise arising from the vibration transmitted via the housing is output from the electroacoustic transducer in the stationary microphones. The principle of the present disclosure may be applied to speakers, thereby making it possible to reduce noise emitted due to transmission of the vibration to the electroacoustic transducer via the housing of the speakers. In short, the vibration is prevented from being transmitted to the electroacoustic transducer via the housing and the noise due to the vibration is thereby prevented from being generated in the electroacoustic transducer device including the housing and the electroacoustic transducer, by providing the supporter formed in the inverted truncated conical shape and including the first portion held in contact with the electroacoustic transducer and the second portion held in contact with the housing, the first portion and the second portion being positioned at mutually different height levels in the axial direction.
Claims (19)
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JPJP2018-134023 | 2018-07-17 | ||
JP2018134023A JP7091900B2 (en) | 2018-07-17 | 2018-07-17 | Electro-acoustic converter |
JP2018-134023 | 2018-07-17 | ||
PCT/JP2019/027407 WO2020017416A1 (en) | 2018-07-17 | 2019-07-10 | Support apparatus and electroacoustic conversion device |
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PCT/JP2019/027407 Continuation WO2020017416A1 (en) | 2018-07-17 | 2019-07-10 | Support apparatus and electroacoustic conversion device |
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JPH079506Y2 (en) * | 1986-11-26 | 1995-03-06 | ソニー株式会社 | Microphone |
JP2930070B2 (en) * | 1997-06-13 | 1999-08-03 | 松下電器産業株式会社 | Electric-mechanical-acoustic transducer |
JP2000217182A (en) * | 1999-01-21 | 2000-08-04 | Kenwood Corp | Excitation woofer |
JP2007096653A (en) * | 2005-09-28 | 2007-04-12 | Nidec Pigeon Corp | Speaker |
JP4305454B2 (en) * | 2005-10-06 | 2009-07-29 | ソニー株式会社 | Actuator, touch panel display device and electronic device |
WO2010150385A1 (en) * | 2009-06-25 | 2010-12-29 | パイオニア株式会社 | Vibration damper and damping mechanism |
KR101111895B1 (en) * | 2010-01-06 | 2012-02-15 | 주식회사 비에스이 | Multi-function micro-speaker |
WO2012114377A1 (en) * | 2011-02-23 | 2012-08-30 | パイオニア株式会社 | Vibration unit |
JP2013014196A (en) * | 2011-07-01 | 2013-01-24 | Sony Corp | Speaker unit |
CN203596912U (en) * | 2012-09-07 | 2014-05-14 | 中石真一路 | Loudspeaker |
KR101626274B1 (en) | 2013-09-09 | 2016-05-31 | 신이치로 나카이시 | Speaker for supporting hearing-impaired people |
GB2525041B (en) * | 2014-04-11 | 2021-11-03 | Sam Systems 2012 Ltd | Sound capture method and apparatus |
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2018
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2019
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US11323799B2 (en) | 2022-05-03 |
JP2020014076A (en) | 2020-01-23 |
WO2020017416A1 (en) | 2020-01-23 |
JP7091900B2 (en) | 2022-06-28 |
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